ECN0001

ECN0001 is the request to not fit D14 and replace F1 and F2 with 0 ohm.

D14 Removal

D14 can interfere with some CEC devices if the Pi is left plugged in and unpowered. The benefits of having it are minimal so it was removed.[1]

F1 & F2 Replacement/Removal

F1 & F2 can cause problems with some USB devices which draw high current. In particular due to the recovery characteristics of the Poly-fuses, it can take a while to recover their low resistance state afterwards, adding
additional problems for other devices (lower voltage on the USB bus).

Model B Revision 2.0

Based on a new PCB layout that includes previous build fixes from ECN0001 such us removal of the poly-fuses in series with the +5V power for USB devices, and other fixes reported by the community such as the erroneous connection of the LAN9512 VDD18CORE pins to the +1V8 power plane, addition of the 8-pin P5 header (non-populated) for extra GPIO pins, addition to the 2-pin P6 header (non-populated) for a RESET button, and other changes and improvements reported in more detail [2].

Raspberry Pi Model-A Full Production Board

Announced: Not Yet (as of 16 June 2012)

Board will now have 256Mb of RAM rather than the originally planned 128Mb[3]

Foundation will probably produce a small Beta batch before handing manufacturing over to RS and Farnell

Raspberry Pi Model-B Full Production Board

The Rpi full production board (model B Rev 2.0)

Announced: April 2012, first orders sent out June 2012.

Manufacturing and Orders will be made through RS and Farnell

This means a much higher volume of units will be produced and made available.